Users And Roles

Tags

SQL

SQL

SQL is the dominant technology for accessing application data. It is increasingly becoming a performance bottleneck when it comes to scalability. Given its dominance, SQL is a crucial skill for all engineers.

Constraints

Constraints

Constraints are used to define rules and relationships. They are applied to a dataset. A constraint may take many forms, such as x ≤ 5 in a programming language and a NOT NULL constraint in a SQL table definition.

Public

Public

Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.